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What are the symptoms of a faulty air conditioning pressure switch?

1 Answers

NaomiRose

07/29/25 4:29pm

The symptoms of a faulty car air conditioning pressure switch are: poor contact of the contacts or abnormal operation of the pressure switch, which can cause the compressor to not work or fail to provide normal pressure protection. The classifications of pressure switches are: 1. Car air conditioning low-pressure switch: The low-pressure switch is installed on the high-pressure pipeline of the refrigeration system. A refrigerant leak in the system can lead to insufficient refrigerant, causing the compressor's vacuum level to rise, ultimately resulting in compressor burnout due to lack of refrigerant. 2. Car air conditioning high-pressure switch: The high-pressure switch is installed on the pipeline at the condenser inlet. It is used to regulate the speed of the fan motor, keeping the condenser pressure within a certain range. 3. Car air conditioning dual-temperature switch: The dual-temperature switch is located near the condenser. The condenser fan motor is controlled by both the high-pressure switch and the engine coolant dual-temperature switch. When the coolant temperature is below 93°C and the air conditioning compressor is not activated, the cooling fan does not operate. 4. Car air conditioning three-stage pressure switch: The three-stage pressure switch in the car air conditioning refrigeration system is installed on the pipeline from the compressor to the condenser. The three-stage pressure switch has three pressure values. When the pressure is below 0.22 MPa or above 3.2 MPa, the compressor's electromagnetic clutch disengages.

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